Journal
CATALYSIS COMMUNICATIONS
Volume 117, Issue -, Pages 90-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2018.09.007
Keywords
Vanadium; Bis(oxazoline); Enantioselective epoxidation; Cation exchange; Laponite
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Funding
- Spanish Ministerio de Economia y Competitividad [CTQ2014-52367-R]
- Diputacion General de Aragon - European Regional Development Funds [E37_17R]
- Tunisien Ministere de l'Enseignement Superieure et la Recherche Scientifique
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Bis(oxazoline)-vanadyl complexes have been prepared from two precursors, VO(acac)(2) and VOSO4, and immobilized on laponite by cation exchange. These catalysts have been tested in the enantioselective epoxidation of styrene with TBHP. The catalytic activities are always much higher in the case of VO(acac)(2). The ligand improves the catalytic activity, with similar or slightly better selectivity to styrene oxide (up to 42%) and up to 63% ee in solution. Laponite support is also beneficial in most cases, with selectivities to styrene oxide up to 60%. Moderate enantioselectivities are obtained, better with VOSO4 solids, up to 72% ee.
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